磷酸改性CeO2纳米棒负载Pt催化剂催化丙烷燃烧性能的研究

doi:10.19964/j.issn.1006-4990.2023-0192

Abstract

Abstract:

With the increasingly serious environmental pollution caused by the emission of pollution sources such as motor vehicles and petrochemicals，the structure of low-carbon alkanes represented by propane is stable，and it is difficult to achieve complete oxidation at low temperature.Therefore，it is urgent to develop high-efficiency low-temperature catalytic oxidation catalysts.The different amounts of phosphoric acid modified 1%Pt/CeO₂-yPO_x catalysts were synthesized by acid modification with cerium oxide nanorods as carrier.It was found that the T₅₀ of propane catalytic combustion was reduced by 60 ℃ after phosphoric acid modification.Through XRD，TEM，EDS mapping and other characterization，it was found that Pt and P were evenly distributed on the surface of cerium oxide，and the structure of cerium oxide remained stable after phosphoric acid modification and Pt loading process.XPS and in-situ CO-DRIFTs showed that after phosphoric acid modification，the particle size of Pt on the surface of the catalyst was increased with the increase of the modification degree of phosphoric acid.There was an optimal Pt²⁺/Pt⁴⁺ ratio，which was beneficial to the adsorption and reaction of propane on the catalyst surface.H₂-TPR and NH₃-TPD showed that a large number of acid sites were generated on the surface of the catalyst after phosphoric acid modification，while phosphoric acid modification did not significantly reduce the redox ability of the catalyst，thus improving the propane combustion activity of the cerium-based catalyst.

Key words: cerium-based catalyst, phosphoric acid modification, propane oxidation, precious metals, rare earth catalysts

CLC Number:

O643.3

JIN Shengshi, LIU Kaijie, LIU Qiuwen, ZHANG Yibo, YANG Xiangguang. Study on catalytic performance of phosphoric acid modified CeO₂ nanorod supported Pt catalyst for propane combustion[J]. Inorganic Chemicals Industry, 2024, 56(1): 141-148.

Figures/Tables 14

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催化剂	CO滴定量/cm³	n（Pt）/ mol	分散度/ %	铂粒径/nm
1%Pt/CeO₂	0.083	5.04×10^-6	73.60	2.57
1%Pt/CeO₂-0.01PO_x	0.079	5.07×10^-6	69.40	2.73
1%Pt/CeO₂-0.03PO_x	0.075	5.13×10^-6	65.50	2.89
1%Pt/CeO₂-0.05PO_x	0.071	5.23×10^-6	60.40	3.14
1%Pt/CeO₂-0.07PO_x	0.065	5.20×10^-6	55.60	3.41
1%Pt/CeO₂-0.10PO_x	0.053	4.78×10^-6	49.20	3.85
1%Pt/CeO₂-0.15PO_x	0.046	4.83×10^-6	42.40	4.47
1%Pt/CeO₂-0.20PO_x	0.030	4.93×10^-6	27.30	6.94

催化剂	峰面积占比/%
催化剂	Ce³⁺	Ce⁴⁺
1%Pt/CeO₂	23.11	76.89
1%Pt/CeO₂-0.01PO_x	19.80	80.20
1%Pt/CeO₂-0.03PO_x	20.18	79.82
1%Pt/CeO₂-0.05PO_x	19.23	80.77
1%Pt/CeO₂-0.07PO_x	21.40	78.60
1%Pt/CeO₂-0.10PO_x	23.78	76.22
1%Pt/CeO₂-0.15PO_x	24.71	75.29
1%Pt/CeO₂-0.20PO_x	25.90	74.10

催化剂	峰面积占比/%
催化剂	Pt²⁺	Pt⁴⁺
1%Pt/CeO₂	100	0
1%Pt/CeO₂-0.01PO_x	95.3	4.7
1%Pt/CeO₂-0.03PO_x	88.2	11.8
1%Pt/CeO₂-0.05PO_x	73.7	26.3
1%Pt/CeO₂-0.07PO_x	68.0	32.0
1%Pt/CeO₂-0.10PO_x	44.6	55.4
1%Pt/CeO₂-0.15PO_x	34.1	65.9
1%Pt/CeO₂-0.20PO_x	27.9	72.1

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Study on catalytic performance of phosphoric acid modified CeO₂ nanorod supported Pt catalyst for propane combustion

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Study on catalytic performance of phosphoric acid modified CeO2 nanorod supported Pt catalyst for propane combustion